ImLab is a free open source graphical application for Scientific Image Processing that runs in Windows, Linux and many other UNIX systems. It supports multiple windows, data types including 32 bit integers, 32 bit real numbers and complex numbers.
A set of Windows command-line utilities to manipulate FITS files
A set of Windows command-line utilities to manipulate FITS files, primarily developed to simplify photometry data reduction process with IRIS (free astronomical image processing software).